Non-Surgical Method for Preventing or Reducing the Rate of the Progression of Non-Proliferative Diabetic Retinopathy and the Treatment of Other Ocular Conditions

Abstract

A non-surgical method for preventing or reducing the rate of the progression of non-proliferative diabetic retinopathy to the proliferative form of diabetic retinopathy comprising intravitreally administering to a patient suffering from non-proliferative diabetic retinopathy an effective amount of serine proteinase enzyme sufficient to create, without surgery, a posterior vitreal detachment to prevent or reduce the progression of proliferative diabetic retinopathy in said patient. Also disclosed is a non-surgical method of treating ocular conditions such as retinal ischemia, retinal inflammation, retinal edema tractional retinal detachment, tractional retinopathy, vitreous hemorrhage and tractional maculopathy by intravitreally administering to a patient suffering from one or more of these conditions with an effective amount of a serine proteinase enzyme to reduce or treat that particular ocular condition. Plasmin, microplasmin and miniplasmin are preferred serine proteinase enzymes and plasmin is the most preferred.

1 . A non-surgical method for preventing or reducing the rate of the progression of non-proliferative diabetic retinopathy to the proliferative form of diabetic retinopathy comprising intravitreally administering to a patient suffering from non-proliferative diabetic retinopathy an effective amount of serine proteinase enzyme sufficient to create, without surgery, a posterior vitreal detachment to prevent or reduce the rate of progression of proliferative diabetic retinopathy in said patient.  
     
     
         2 . A method according to  claim 1 , wherein said serine proteinase enzyme is selected from the group consisting essentially of plasmin, microplasmin and miniplasmin derived from either human plasma or from recombinant technology.  
     
     
         3 . A method according to  claim 1 , wherein said serine proteinase enzyme is plasmin.  
     
     
         4 . A method according to  claim 3 , wherein said plasmin is obtained from plasminogen fractionated from human blood.  
     
     
         5 . A method according to  claim 1  or  3 , wherein said effective amount of serine proteinase enzyme injected into the vitreous is equivalent to about 0.5 to about 1000 μg of plasmin.  
     
     
         6 . A method according to  claim 1  or  3 , wherein said effective amount of serine proteinase enzyme injected into the vitreous is equivalent to about 1.0 to 500 μg of plasmin.  
     
     
         7 . A method according to  claim 1  or  3 , wherein said effective amount of serine proteinase enzyme injected into the vitreous is equivalent to about 10 to 400 μg of plasmin.  
     
     
         8 . A method according to  claim 1  or  3 , wherein said effective amount of serine proteinase enzyme injected into the vitreous is equivalent to about 20 to 300 μg of plasmin.  
     
     
         9 . A method according to  claim 1  or  3 , wherein said effective amount of serine proteinase enzyme injected into the vitreous is equivalent to about 50 to 200 μg of plasmin.  
     
     
         10 . A method according to  claim 1 , wherein said intravitreally administering is by injection into the vitreous body.  
     
     
         11 . A method according to  claim 1 , wherein said intravitreally administering is by injection using a 25 or higher gauge needle into the vitreous.  
     
     
         12 . A method according to  claim 1 , wherein said intravitreally administering is by injection using a 25 or higher gauge needle to administer volumes of 10 to 200 uL.  
     
     
         13 . A method according to  claim 1 , wherein said intravitreally administering is by injection using a 25 or higher gauge needle to administer volumes of 50 to 100 uL.  
     
     
         14 . A method according to  claim 1 , wherein said serine proteinase enzyme is plasmin, said effective amount is about 50 to 200 μg of plasmin and said plasmin is administered by injection into the vitreous.  
     
     
         15 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body of a solution containing the serine proteinase enzyme.  
     
     
         16 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body of a micelle solution containing the serine proteinase enzyme.  
     
     
         17 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body of a suspension of solid particles either containing the serine proteinase enzyme or with the enzyme as the particles.  
     
     
         18 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body of a liposome solution wherein the serine proteinase enzyme is either within the aqueous core of the liposome, in the excluded volume of the liposome solution or both.  
     
     
         19 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body of an oil in water emulsion wherein the serine proteinase enzyme is present either adsorbed to the oil droplets or present in the continuous aqueous phase of the emulsion.  
     
     
         20 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body a powder dispersed in a nonaqueous medium wherein the powder is the serine proteinase enzyme.  
     
     
         21 . A method according to  claim 10 , wherein said intravitreally administering is by injection into the vitreous body a rapidly dissolving mini-tablet containing the serine proteinase enzyme and relevant excipients.  
     
     
         22 . A method according to any one of claims  15 - 21  wherein said intravitreally administering is by injection into the vitreous body of a formulation which is sterile and endotoxin free as per UPS guidelines.  
     
     
         23 . A method according to any one of claims  15 - 21  wherein said intravitreally administering is by injection into the vitreous body of a formulation which is sterile and endotoxin free as per UPS guidelines and contains stabilizing moieties.  
     
     
         24 . A method according to  claim 23  wherein said stabilizing moiety is selected from the group consisting essentially of epsilon amino caproic acid, lysine, arginine, serum albumen, or ammonium bicarbonate.  
     
     
         25 . A method according to  claim 24 , wherein said stabilizing moiety is epsilon amino caproic acid.  
     
     
         26 . A method according to  claim 10  wherein said intravitreally administering is by injection of a solution comprised of the serine proteinase enzyme of interest and normally acceptable pharmaceutical excipients with the addition of a component designed to increase the density of the formulation such that post injection, the formulation will tend to sink towards the retina of the patient as the patient in laying on his/her back.  
     
     
         27 . A method according to  claim 26 , wherein the substance providing increased density is selected from the group consisting essentially of soluble iodinated X-ray contrast agents, including iohexol, iodixanol, diatrizoic acid, iopamidol, iomeprol, iodixanol, tri-iodinated benzene, and lipiodol, elevated concentrations of sucrose and other sugars, and heavy metal complexes known to be safe for use in the body, such as MRI contrast agents including Omniscan®.  
     
     
         28 . A method according to  claim 10  wherein the injection of said serine proteinase enzyme is preceded by the injection of a chemical spreading agent, e.g., Vitrase® or hylauronidase.